Choice certainty is informed by both evidence and decision time.
Choice certainty is informed by both evidence and decision time.
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DOI：
10.1016/j.neuron.2014.12.015
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发表时间：
2014-12-17
期刊：
影响因子：
16.2
通讯作者：
Shadlen, Michael N.
中科院分区：
文献类型：
--
作者：
Kiani, Roozbeh;Corthell, Leah;Shadlen, Michael N.
“确定度”是指在反馈之前对决策正确性的主观信念。对确定性的可靠估计对于预测、从错误中学习以及在结果不是立即发生的情况下规划后续行动至关重要。一般认为，确定性是由决策时的证据神经表征所告知的。在这里，我们表明，确定性也是由形成决定所花费的时间所告知的。人类受试者同时报告了他们对嘈杂的移动点方向的选择和信心。敏捷度与反应时间呈负相关，与运动强度呈正相关。此外，即使对于错误响应，这些相关性也被保留，这一发现与基于信号检测理论的确定性的现有解释相矛盾。我们还设计了一个刺激操纵，导致更长的决策时间，而不影响选择的准确性，从而表明，审议时间本身通知确定性的估计。我们认为，过去的决策时间通知确定性，因为它作为任务难度的代理。
“Degree of certainty” refers to the subjective belief, prior to feedback, that a decision is correct. A reliable estimate of certainty is essential for prediction, learning from mistakes, and planning subsequent actions when outcomes are not immediate. It is generally thought that certainty is informed by a neural representation of evidence at the time of a decision. Here we show that certainty is also informed by the time taken to form the decision. Human subjects reported simultaneously their choice and confidence about the direction of a noisy display of moving dots. Certainty was inversely correlated with reaction times and directly correlated with motion strength. Moreover, these correlations were preserved even for error responses, a finding that contradicts existing explanations of certainty based on signal detection theory. We also contrived a stimulus manipulation that led to longer decision times without affecting choice accuracy, thus demonstrating that deliberation time itself informs the estimate of certainty. We suggest that elapsed decision time informs certainty because it serves as a proxy for task difficulty.
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影响因子：
3.7
作者：
Drugowitsch J;Moreno-Bote R;Pouget A
通讯作者：
Pouget A
影响因子：
1.9
作者：
BRITTEN, KH;SHADLEN, MN;MOVSHON, JA
通讯作者：
MOVSHON, JA
影响因子：
16.2
作者：
Beck JM;Ma WJ;Kiani R;Hanks T;Churchland AK;Roitman J;Shadlen MN;Latham PE;Pouget A
通讯作者：
Pouget A
DOI：
10.1037/0096-1523.24.3.929
发表时间：
1998-06-01
影响因子：
2.1
作者：
Baranski, JV;Petrusic, WM
通讯作者：
Petrusic, WM
DOI：
10.3758/bf03205299
发表时间：
1994-04-01
期刊：
PERCEPTION & PSYCHOPHYSICS
影响因子：
--
作者：
BARANSKI, JV;PETRUSIC, WM
通讯作者：
PETRUSIC, WM